MESON Chess Problem Database

Problem Display
PID: 102513 (8/3p4/3P1p2/2K1kp2/3pN2Q/3P4/8/8 w - - 0 1)

Saferis, AM

Europe Echecs, 1964

8/3p4/3P1p2/2K1kp2/3pN2Q/3P4/8/8

#2

5 + 5

6490 yacpdb 2009
5454 Near Snap 2010

SOLUTION

  • SOUND
  • Sets
    • 1...Ke6
      • 2.Qxf6#
    • 1...fxe4
      • 2.Qxe4#
    • 1...f4
      • 2.Qxf6#
  • Tries
    • 1.Kc4?
      • 1...Ke6
        • 2.Qxf6#
      • 1...f4
        • 2.Qxf6#
      • 1...fxe4!
    • 1.Qg5?
      • 1...Ke6
        • 2.Qxf6#
      • 1...fxg5!
    • 1.Qh5?
      • 1...Ke6
        • 2.Qe8#
      • 1...Kf4!
    • 1.Qh6?
      • 1...Ke6
        • 2.Qxf6#
      • 1...f4
        • 2.Qxf6#
      • 1...fxe4!
  • Keys
    • 1.Qe1!
      • 1...Kf4
        • 2.Qg3#
      • 1...Ke6
        • 2.Sg5#
      • 1...fxe4
        • 2.Qxe4#
      • 1...f4
        • 2.Sg3#

Anticipated by 21309(1918), 77239(1927)

This anticipates 12404(1978), 150698(1982), 79321(1988), 203054(1990), 245207(2000)

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(b);P-FLIGHT::QAR1(C),XP(d)
    • P(c);OGATE,XS(B)::QAR1(C),XP(c)
    • P(c);::QAB1(C),XP(d)
  • Tries
    • Try
      • K(D);P-FLIGHT
      • Vars
        • K(b);P-FLIGHT::QAR1(C),XP(d)
        • P(c);::QAB1(C),XP(d)
      • Refutation
        • P(c);XS(B)
    • Try
      • Q(C);P_PINP(c)
      • Vars
        • K(b);N_SPINP(c),P-FLIGHT::QAR1(C),XP(d)
      • Refutation
        • P(d);N_SPINP(c),XQ(C)
    • Try
      • Q(C);P_PINP(c)
      • Vars
        • K(b);N_SPINP(c),P-FLIGHT::QAR2(C)
      • Refutation
        • K(b);N_SPINP(c),S_FLIGHT
    • Try
      • Q(C);
      • Vars
        • K(b);P-FLIGHT,P_SPINP(d)::QAR1(C),XP(d)
        • P(c);::QAB1(C),XP(d)
      • Refutation
        • P(c);XS(B)
  • Actual
    • Q(C);
    • Vars
      • K(b);S_FLIGHT::QAB1(C)
      • K(b);P-FLIGHT::QAR(C)+S(B),DCHECK
      • P(c);OGATE,P_SPINP(c),XS(B)::QAR1(C),XP(c)
      • P(c);SBLOCK::QAR(C)+S(B)
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Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).